Installing pip for Blender and GDAL
Try to use Command Prompt as an administrator  to ensurepip?



You may need to change your directory by cd "the/folder/blender/python"

It seems like the system block out the process during I/O writing to the Blender installed folder.

And be careful, Blender uses its own Python in the installed folder as the default executable Python. You may want to bind that python for installing thing through pip install.